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4 years ago

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How does absorption spectra occur?

1 answer:

Arlecino [84]4 years ago

3 0

An absorption spectrum occurs when light passes through a cold, dilute gas and atoms in the gas absorb at characteristic frequencies; since the re-emitted light is unlikely to be emitted in the same direction as the absorbed photon, this gives rise to dark lines (absence of light) in the spectrum.

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Calculate the wavelength of an orange light wave with a frequency of 5.085 x 10^14 Hz. The speed of light is 3.0 x 10^8 m/s.

Margarita [4]

Answer:

5.9 x 10⁻⁷m

Explanation:

Given parameters:

Frequency = 5.085 x 10¹⁴Hz

Speed of light = 3.0 x 10⁸m/s

Unknown:

Wavelength of the orange light = ?

Solution:

The wavelength can be derived using the expression below;

wavelength = $\frac{v}{f}$

v is the speed of light

f is the frequency

wavelength = $\frac{3 x 10^{8} }{5.085 x 10^{14} }$ = 5.9 x 10⁻⁷m

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3 years ago

A 55- kg woman has a momentum of 220 kg.m/s. What is her velocity?

exis [7]

Answer:

P=mv

Momentum=mass*velocity

Mass=55kg

Velocity=?

Momentum=220kg.m/s

P=mv

v=p/m

v=220/30

v=7.33m/s

Explanation:

6 0

3 years ago

If heat Q is required to increase the temperature of a metal object from 4 ∘C to 7∘C, the amount of heat necessary to increase i

alisha [4.7K]

Answer:

4Q

Explanation:

Case 1 :

$m$ = mass of the metal

$c$ = specific heat of the metal

$\Delta T$ = Change in temperature = 7 - 4 = 3 C

Amount of heat required for the above change of temperature is given as

$Q = m c \Delta T\\Q = m c (7 - 4)\\Q = 3 m c$

Case 2 :

$m$ = mass of the metal

$c$ = specific heat of the metal

$\Delta T$ = Change in temperature = 19 - 7 = 12 C

Amount of heat required for the above change of temperature is given as

$Q' = m c \Delta T\\Q' = m c (12)\\Q' = (4)(3 m c)\\Q' = 4Q$

Hence the correct choice is

4Q

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3 years ago

Read 2 more answers

Two train whistles, and , each have a frequency of 392 Hz. is stationary and is moving toward the right (away from ) at a speed

trasher [3.6K]

Answer:

Part a)

f = 371.1 Hz

Part b)

f = 417.7 Hz

Part c)

beat frequency = 46.6 Hz

Explanation:

Part a)

Due to doppler's Effect the frequency of the sound heard by the train which is moving away from the observer is given as

$f_1 = f_0\frac{v + v_o}{v + v_s}$

$f_1 = 392(\frac{340 + 15}{340 + 35})$

$f_1 = 371.1 Hz$

Part b)

Now from the second train which is approaching the person we can say

$f_2 = f_0\frac{v - v_o}{v - v_s}$

$f_2 = 392(\frac{340 - 15}{340 - 35})$

$f_2 = 417.7 Hz$

Part c)

As we know that beat frequency is the difference in the frequency from two sources

$f_b = f_2 - f_1$

$f_b = 417.7 - 371.1 = 46.6 Hz$

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3 years ago

A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machi

Dmitry_Shevchenko [17]

= (3,760 joule/sec) / (4,000 joule/sec)

= 3,760 / 4,000 = 0.94 = 94%

8 0

4 years ago